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      <a href="../index.html">all files</a> / <a href="index.html">service/</a> MACDService.ts
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { Injectable } from '@angular/core';
&nbsp;
import { EMAService } from 'service/EMAService';
import { QuoteBasic } from 'service/QuoteBasic';
import { IMACDService } from 'interface/IMACDService';
&nbsp;
@Injectable()
export class MACDService implements IMACDService {
&nbsp;
  connection;
&nbsp;
  constructor(private emaService:EMAService) {
&nbsp;
  }
&nbsp;
  compute(quote:QuoteBasic, lday:number, sday:number, mday:number):Array&lt;any&gt; {
    const lemaList = this.emaService.compute(quote, lday);
    const semaList = this.emaService.compute(quote, sday);
    const difList = [];
    const deaList = [];
    const macdList = [];
    const count = quote.close.length;
    const x = 2 / (mday + 1);
&nbsp;
    if(lday &gt; 0 &amp;&amp; sday &gt; 0 &amp;&amp; mday &gt; 0 ) {
      for(let i=0; i&lt;count; i++) {
        const dif = semaList[i] -lemaList[i];
        difList.push(parseFloat(dif.toFixed(4)));
        if (i == 0) {
          deaList.push(0);
          macdList.push(0);
          continue;
        }
&nbsp;
        const dea = deaList[i-1] * (1-x) + x*dif;
        deaList.push(parseFloat(dea.toFixed(4)));
        const macd = dif - dea;
        macdList.push(parseFloat(macd.toFixed(4)));
      }
    }
&nbsp;
    return [
      difList,
      deaList,
      macdList
    ];
  }
&nbsp;
  update(quote:QuoteBasic, lday:number, sday:number, mday:number, difList:Array&lt;any&gt;, deaList:Array&lt;any&gt;, macdList:Array&lt;any&gt;):Array&lt;any&gt; {
    const originCount = quote.close.length;
    const oldCount = difList.length;
    if(lday &gt; 0 &amp;&amp; sday &gt; 0 &amp;&amp; mday &gt; 0 &amp;&amp; originCount &gt; 0) {
&nbsp;
      if(oldCount === 0) {
        return this.compute(quote,lday,sday,mday);
      }
&nbsp;
      const x = 2 / (mday + 1);
&nbsp;
      const lemaList = this.emaService.compute(quote, lday);
      const semaList = this.emaService.compute(quote, sday);
&nbsp;
      const dif = parseFloat((semaList[originCount-1] -lemaList[originCount - 1]).toFixed(4));
      const dea = parseFloat((deaList[oldCount-1] * (1-x) + x*dif).toFixed(4));
      const macd = dif - dea;
&nbsp;
      if (oldCount &lt; originCount) {
        difList.push(dif);
        deaList.push(dea);
        macdList.push(macd);
      } else {
        difList[originCount-1] = dif;
        deaList[originCount-1] = dea;
        macdList[originCount-1] = macd;
      }
    }
&nbsp;
    return [
      difList,
      deaList,
      macdList
    ];
  }
}
&nbsp;</pre></td></tr>
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